Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f6cd0a6582155d…

MALICIOUS

PDF

72.3 KB Created: 2021-03-20 17:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ad4bdc5e9d96c2238659b165f36261ed SHA-1: 19d700001de9eeea27329db6fd2638a20c90de64 SHA-256: e4f6cd0a6582155d6bb7d031989670aca6fac2b12b6ab5f6590cae1070daf11f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, https://mezovuduw.ru/wix?keyword=ap+physics+2+multiple+choice+2017, is likely part of the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/wix?keyword=ap+physics+2+multiple+choice+2017 PDF link annotation
    • http://bijepitujutix.sportsontheweb.net/motor_vehicle_technology_books.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/author_s_purpose_worksheets_3rd_grade.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/metro_2035_book_review.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/types_of_banquet_set_up.pdfIn PDF document text
    • http://meetsucre.pro/what_is_the_best_rated_denture_adhesivebmh14.pdfIn PDF document text
    • http://mebelintera.ru/joxeguroxotedevebipus0u1i.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/free_mixed_parts_of_speech_worksheets_with_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/edhgghf/jumolotoluseji.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/dgc62Lj/pinball_arcade_season_2_ps4_table_list.pdfIn PDF document text
    • http://terugate.mypressonline.com/what_business_use_cloud_computing.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_connect_ipega_to_iphone_7.pdfIn PDF document text
    • https://cdn.sqhk.co/tozerutiwezu/dI3jbig/tornado_smashing_house.pdfIn PDF document text
    • http://kino-vezde.ru/20309271046zni4a.pdfIn PDF document text
    • http://linefofaxugedu.mywebcommunity.org/edema_agudo_pulmonar_pediatria.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/Ravj9hj/xilebak.pdfIn PDF document text
    • http://shmelev.pro/voxanuwujewidupezwbhe5.pdfIn PDF document text
    • http://dwatches.site/xarapavofov21e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3655a781-61f6-4858-acf9-9eefbbcb7c78/la_republica_de_platon_editorial_gredos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3edfe48-6261-4aea-a72c-9af6246a95b0/conversion_de_ml_a_gramos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08b62cf-d386-4230-8165-c413880c6dcd/short_summary_of_percy_jackson_and_the_last_olympian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b1b5b8-ae38-48fc-999b-bd137af7368f/ponufifapowepabugot.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/que_es_psicologa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 5140 bytes
SHA-256: 638ca60dab7a15331dadcc7dca49f8a73c3a952a596926df86ba73c89e0bb13c
font_01_sfnt_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 10352 bytes
SHA-256: bd54c4206826dc3cb923eeae7a2a07169c24c8b9936e7c993a3f0fc05767f0db
font_02_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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